Gas cut-off.



E. T. THAYER, JR. GAS CUT-OFF.

APPLICATION FILED MAR. 17, 1913.

1,080,389. Patented Dec. 2, 1913.

lfi willll 1/ CC I 6 ,i fi WW3? [-1 $1 A ///1/// v .nlllllllllllllh. ll.76 I 5 6y 3 7/ 62 WITNESSES INVENTOR (2%6 J7 [44/5 I ifi/z/zd L 8. Z fLW 1/7 BY ATTORNEYS ELLIS TODD THAYER, JR., OF CHARLESTON, WESTVIRGINIA.

GAS CUT-OFF.

Specification of Letters Patent.

Application filed March 17, 1913.

Patented Dec. 2, 1913.

Serial No. 754,736.

To all whom it may concern:

Be it known that I, ELLIs T. THAYER, J r., a citizen of the UnitedStates, and a resident of Charleston, in the county of Kanawha and Stateof West Virginia, have invented a new and useful Improvement in GasCut'Ofi's, of whie-h the following is a specification. I

My invention is an improvement in gas cut-offs, and has for its objectto provide a cut-off of the characterspecified, which will automaticallyclose when the pressure falls below a predetermined point, and whichwill be held closed by the pressure until it is again opened.

In the drawings: Figure 1 is a vertical section of the improved cut-ofi,Fig. 2 is a section at right angles to Fig. 1, and Fig. 3 is an endview. I

The present embodiment of the invention comprises a casing 1 ofrectangular cross section having at one end a threaded nipple 2, nearthe upper face of the casing and hav-, ing at the other a tubularextension 3, provided at its outer end with an internally threadednipple 4, the said nipple being in alinement with the nipple 2. Thecasing is also provided with an internally threaded boss 5, in its upperface, near the nipple 2, and a short section of pipe 6, is threadedthrough the boss and is engaged by a lock ring or nut 7, at the innerface of the boss to prevent disengagement of the pipe section.

A shallow cupped disk 8 is provided with a central internally threadedboss 9, for engaging the upper end of the pipe, and a lock ring 10,similar to the ring 7, is engaged with the pipe above the disk. The

pipe thus forms a communication between the casing and'the upper face ofthe disk.

One of the side faces of the casing 1 is provided with a depression orrecess forming a bearing anda packing receptacle 11, and a packing nut12 is threaded into the recess, a packing 13 being arranged between thebottom of the recess and the inner end of the nut. r

A shaft 14 is journalcd in the bearing recess and packing nut, and in astepped hearing 15 at the opposite side of the casing 1, and an arm 16is connected with the outer end of the shaft, being held thereon bymeans of a pin 17.

A weight 18 is slidable on the arm 16,

and a set screw 19 is threaded through the weight and engages the arm tohold the weight in adjusted position. The end of the shaft is reduced toengage the bearing 15 and between the bearing recess 11 and the saidbearing, the shaft is polygonal in cross section, and an arm 21 isprovided with a hub 20, fitting upon the said polygonal portion. The arm21 extends at approximately a right angle to the arm 16 and engages anopening in a link 22.

Each face of the casing is provided with an inwardly extending lug 23and 23 respectively, and the meeting ends of the said lugs are recessedto form a transverse opening 24 through which the link 22 extends. Thelink is provided with a cross head 25, adjacent to the opening for thearm 21,and a coil spring 26 is arranged between the cross head and thebar 23.

The end of the link 22 adjacent to the arm 21 is received between spacedlugs 27 on the inner face of a disk valve 28 and the lugs are conncctedto the ends of the link by means of a cotter pin 29. The disk valve 28cooperates with the inner end of the tubular extension 3, and a guidevane 30 of X- shape is connected with the outer face of the valve, andmoves in the extension 3. The said extension is provided with twoconcentric bushings 31 and 32, the former of glass and the latter ofcement or the like, between the guide vane and the inner surface of theextension. The valve 28 closesagainst the end of the, glass bushing. Alever 33 is pivoted at one end to a lug 34 at the end of the casingadjacent to the nipple 2, and the op posite end of the lever is beveledas shown at 35, and bears against the beveled end of an arm 36 pivotedto the adjacent end of the link 22. The said link end is slotted asshown, and connected to the arm by a pivot pin 37. i

A flexible diaphragm 38 has its ends arranged on the edge of the cuppeddisk8, and a holding ring 39 is bolted to the said edge by bolts andnuts 40, to hold the diaphragm to the disk. A stem 41 has its lower endpivoted to the lever 33 intermediate the ends thereof and the said stemextends through the pipe 6, through an opening in the diaphragm andabove the diaphragm to engage the horizontal portion 42 of an armcomprising the said horizontal portion and a curved portion 43, whoseouter end is pivoted to the cupped disk as shown at 1 1.

At the point where the stem passes through the diaphragm 38, holdingnuts 45 are threaded on to the stem at opposite sides of the diaphragmand washers 46 are arranged between the nuts and the faces of thediaphragm to make a fluid tight connection. The lower face of the arm 42is provided with a head 47 and the said head engages the upper end ofthe valve stem 41. A weight 48 is slidable on the portion 42 of the saidarm and the said weight is held in adjusted position by a set screw 49.

In use, the casing is interposed in the pipe through which the gasflows, the nipple 4 being connected with one end of the pipe and thenipple 2 with the other in such manner that the gas must flow throughthe casing 1. It will be noticed that one side of the casing 1 isprovided with a removable cover plate 50, the said cover plate beingsecured to the casing by means of screw bolts 51 or the like to permitthe removal of the said cover plate when it is desired to obtain accessto the interior of the casing. The gas enters through the nipple 2,passes through the casing 1, the tubular extension 3 and from the casingthrough the nipple 4. The spring 26 acts normally to close the valve.When the parts are in the position of Fig. 1, the

arm 36 which is freely movable on the end of the link, takes .a positionat right angles to the link, and the beveled end of the lever by itsengagement with the beveled end of the arm holds the link against thepressure of the spring and against the pressure of the weight 18 in openposition; To open the valve the arm 16 is lifted to cause the arm 21 tomove the link inwardly until the arm 36 falls into the position ofFig. 1. The lever 4243 is then lifted, and the in-flowing gas holds thesaid lever lifted by its pressure on the diaphragm and so holds thelever 33 in engagement with the arm 36. As long as the gas flows theparts will remain in this osition. When the pressure in the casing isrelaxed, the diaphragm will move downward to cause the lever 33 torelease the arm 36, and the weight and the spring will close the valve.By means of the weights 18 and 48, the device may be arranged to cut offwhenever the pressure falls below a predetermined point. That face ofthe valve 28 adjacent to the bushing is provided with a gasket 52, whichbears against the end of the'glass bushing. It will be noted that theends of the in 37 are flush with the side edges of the hnk 22, in orderthat the link may slide through the opening formed by the recesses inthe inner ends of the lugs 23-23. By arranging the open- .ing in therecess of the lug 23-23 the link is easily disengaged.-

I claim r v 1. A device of the character specified, comprising a casingadapted to be interposed in a gas supply pipe and having openings at itsopposite ends for receiving the ends of the pipe, said casing having avalve seat at one of the openings and a valve seating against the saidseat, a link connected at one end to the valve, said casing having aninwardly extending lug provided with an opening through which the linkextends, a spring normally pressing the valve toward its seat,- a catchpivoted to the inner end of the link and adapted to take a position atright angles to the link and in engagement with the lug to hold thevalve open when the said valve has been opened, a lever pivoted to thopposite end of the casing from the valve and engaging the arm toprevent the said arm moving into alinement with the link, a diaphragmacted upon by the pressure within the casing, a stem connecting thediaphragm with the lever, said diaphragm holding the lever in positionto lock the arm when the pressure in the casing ex ceeds a predeterminedpoint, and means out side the casing for opening the valve against theresistance of the spring.

2. A device of the character specified, comprising a casing adapted tobe interposed in a gas pipe and having a valve seat and a valvecotiperating with the seat for controlling the passage of the gasthrough the casing, a shaft journaled in the casing and havlng an armengaging the valve, said shaft having an arm outside the casing foroscillating the shaft for opening and closing the valve, said last namedarm extending approximately horizontal, a weight adjustable on the armto move the valve into closed position, a catch for holding the valveopen and means controlled by the pressure in the casing for releasingthe catch to permit the weight to close the valve when the pressurefalls below a pre-determined point.

'3. A device of the character specified, comprising a casing adapted tobe interposed in a gas pipe and having a valve for controlling the flowof the gas through the casing, an arm outside the casing connected withthe valve for opening and closing the said valve, means in connectionwith the arm and adjustable with respect thereto for moving the said armto close the valve, releasable means for holding the valve open, andmeans controlled by the pressure in the casing for releasing the saidmeans when the pressure falls below a pre-determined point.

. ELLIS TODD THAYER, JR.

Witnesses:

WILLIAM T. HAMILTON, HERBERT A. YATES.

